Jefferson, Oklahoma climate: Normal weather by month, frost dates and records
Jefferson's normal year runs from 20°F January nights to 95°F July afternoons, with 33.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.2°C, January lows of −7°C, July highs of 35°C, 860 mm of precipitation a year.
- NOAA stationJefferson (3 mi SE)
- Station IDUSC00344573
- Location36.69°N 97.75°W
- Elevation1,043 ft (318 m)
- Population10
On October 23, the normal high in Jefferson is 71°F and the normal low 41°F, and the chance of measurable rain or snow is 18%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jefferson.
- Jan 48° 20°
- Feb 52° 23°
- Mar 62° 32°
- Apr 71° 41°
- May 80° 53°
- Jun 90° 63°
- Jul 95° 68°
- Aug 94° 66°
- Sep 85° 57°
- Oct 74° 44°
- Nov 60° 32°
- Dec 49° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Jefferson each month?
July is the warmest month, with normal highs of 95°F; January the coldest, with normal lows of 20°F. The most precipitation falls in May (4.79 in), the least in January (1.02 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 48°F | 20°F | 33.9°F | 1.02 | 4 | <1 | 27 | 9 h 50 min |
| February | 52°F | 23°F | 37.8°F | 1.17 | 5 | <1 | 21 | 10 h 50 min |
| March | 62°F | 32°F | 46.8°F | 2.28 | 6 | <1 | 14 | 11 h 50 min |
| April | 71°F | 41°F | 56.1°F | 3.67 | 7 | 1 | 4 | 13 h 10 min |
| May | 80°F | 53°F | 66.5°F | 4.79 | 10 | 5 | <1 | 14 h 10 min |
| June | 90°F | 63°F | 76.4°F | 4.52 | 8 | 17 | <1 | 14 h 40 min |
| July | 95°F | 68°F | 81.2°F | 3.76 | 7 | 25 | <1 | 14 h 30 min |
| August | 94°F | 66°F | 79.7°F | 3.74 | 7 | 23 | <1 | 13 h 40 min |
| September | 85°F | 57°F | 71.0°F | 2.69 | 6 | 11 | <1 | 12 h 30 min |
| October | 74°F | 44°F | 58.6°F | 3.10 | 6 | 2 | 3 | 11 h 20 min |
| November | 60°F | 32°F | 45.9°F | 1.66 | 4 | <1 | 14 | 10 h 10 min |
| December | 49°F | 23°F | 35.9°F | 1.45 | 5 | <1 | 25 | 9 h 40 min |
| Year (annual) | 72°F | 43°F | 57.5°F | 33.85 | 73 | 83 | 110 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 9°C | −7°C | 1.1°C | 26 mm |
| February | 11°C | −5°C | 3.2°C | 30 mm |
| March | 17°C | 0°C | 8.2°C | 58 mm |
| April | 22°C | 5°C | 13.4°C | 93 mm |
| May | 27°C | 12°C | 19.2°C | 122 mm |
| June | 32°C | 17°C | 24.7°C | 115 mm |
| July | 35°C | 20°C | 27.3°C | 96 mm |
| August | 34°C | 19°C | 26.5°C | 95 mm |
| September | 30°C | 14°C | 21.7°C | 68 mm |
| October | 23°C | 7°C | 14.8°C | 79 mm |
| November | 16°C | 0°C | 7.7°C | 42 mm |
| December | 9°C | −5°C | 2.2°C | 37 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Enid (20 miles away), gets 9 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00344573; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Jefferson?
Normal highs sit between 65°F and 85°F in April, May and October. Of those, October has the fewest days with rain (6).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00344573.
When is the last frost in Jefferson?
In Jefferson, the last spring frost (32°F) comes after April 18 in half of years and after May 2 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 4 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 181 year in 10 after May 2; 9 in 10 after April 4
- First autumn frost, half of years before
- October 201 year in 10 before October 4; 9 in 10 before November 2
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 202 days.
A hard freeze (28°F) comes after April 9 in half of springs and before October 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jefferson in zone 7a in ZIP code 73766, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Jefferson's NOAA station is in zone 7a: the coldest night of a typical year reaches 2°F (20 complete years).
Frost dates for every NOAA station in Oklahoma · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00344573; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Jefferson?
In a normal year in Jefferson, 83 days a year reach 90°F (22 of them 100°F or more), 110 nights fall to 32°F or colder and 73 days bring measurable precipitation.
- Days at 90°F or more
- 83a normal year
- Days at 100°F or more
- 22a normal year
- Nights at 32°F or colder
- 110a normal year
- Days that stay below freezing
- 9high of 32°F or less
- Days with 0.01 inch of precipitation
- 73a normal year
The highest temperature in this station's record (since 1894) is 118°F, on August 12, 1936; the lowest is −23°F, on February 13, 1905.
The wettest calendar year on that record is 1987, with 54.92 in; the snowiest season is 1939–40, with 33.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00344573; records: ACIS (NOAA Regional Climate Centers), station USC00344573. Records use complete months only; a month missing more than three days is left out.
How sunny is Jefferson?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Jefferson, 4.7 kWh per square metre a day. July is the sunniest month (87%) and February the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.7 |
| February | 74% | 3.4 |
| March | 74% | 4.4 |
| April | 76% | 5.5 |
| May | 77% | 6.1 |
| June | 86% | 7.0 |
| July | 87% | 6.9 |
| August | 86% | 6.1 |
| September | 84% | 5.1 |
| October | 80% | 3.9 |
| November | 80% | 2.9 |
| December | 74% | 2.3 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Jefferson need?
A normal year in Jefferson brings 4,409 heating degree days, 18% fewer than the median U.S. place (5,373), and 1,705 cooling degree days, 88% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,528 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 964 | 0 |
| February | 762 | 0 |
| March | 567 | 3 |
| April | 286 | 19 |
| May | 78 | 125 |
| June | 3 | 345 |
| July | 0 | 504 |
| August | 0 | 456 |
| September | 35 | 215 |
| October | 236 | 38 |
| November | 576 | 1 |
| December | 902 | 0 |
| Year (annual) | 4,409 | 1,705 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00344573. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Jefferson's climate compare?
Jefferson is warmer than 9 of the other 133 places with their own NOAA record in Oklahoma, and wetter than 40. Across the 7,247 U.S. stations with normals, its annual mean of 57.5°F is warmer than 68%.
In the Köppen classification computed from these normals, Jefferson is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Jefferson share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Pond Creek, OK893 people · 3 mi W
- Lamont, OK293 people · 11 mi E
- Hunter, OK141 people · 10 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Jefferson's climate
What is the coldest month in Jefferson?
January, with a normal high of 48°F and a normal low of 20°F. The warmest is July (95°F by day, 68°F at night).
Does it snow in Jefferson?
Yes. NOAA publishes no 1991-2020 snowfall normal for Jefferson's NOAA station; the nearest record that keeps one, Enid (20 miles away), records 9 inches of snow in a normal year.
What is the rainiest month in Jefferson?
May, with 4.79 in of precipitation in a normal year; the driest is January with 1.02 in.
What plant hardiness zone is Jefferson in?
The USDA's 2023 map puts Jefferson in zone 7a in ZIP code 73766, the nearest ZIP area. By the same method at Jefferson's NOAA station, the coldest night of a typical year reaches 2°F (20 years, 1991-2020): zone 7a.
How late can frost come in Jefferson?
In half of years the last 32°F night comes after April 18; in one year in ten it comes after May 2. Waiting until May 2 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oklahoma climateThe statewide normals and every place in the state
- Medford, OK7 miles from this station, 58.7°F a year
- Breckinridge 3 mi SE Mesonet, OK19 miles from this station, 59.1°F a year
- Enid, OK20 miles from this station, 59.6°F a year
- Billings, OK20 miles from this station, 58.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made